Like any fine art, there are a few ways to implement it. Every sofa collection has various ways to decorate with pillows, but ultimately it will depend on the home's aesthetic and colour palette.
Colour and Texture
Contrast works differently. The result is still art, just with a few unexpected pops. Use the colour wheel as a guide to select throw pillows on the opposite end of the spectrum from the sofa or other furniture. Be sure one colour is dominant in the design, but add in a few other accent pieces in the complementary colour to tie the whole room together.
Switching up texture is possible, too. The only problem is that it can be a bit tricky to handle. When there are different textures everywhere, the space looks cluttered. Add in one interesting textured throw pillow to the design, but keep the rest of the pillows more neutral.
Placement
Symmetry is a common choice, especially for sleek modern designs or more traditional aesthetics. Start on the edges of the sofa with the largest throw pillows, which are called anchor pillows, and build inward to create the symmetrical design. Try mixing up the size and shape of pillows, especially with the central pillow that acts as a focal point in the design.
Asymmetry can work. However, it depends on the use of graphics, colours and textures. Merely having a few more pillows on one side is not going to make asymmetry look good. There has to be some interesting element that keeps the balance between both sides without making them look the same.
For more living room inspiration, check out the Nordesign showroom in Calgary for furniture and home accents to match any style.